Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f59e6a1c8367ea…

MALICIOUS

PDF

37.8 KB Created: 2020-07-08 16:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 0947ba75cc7735e4afa1a7672a412116 SHA-1: c085042c35d4892c2fdaa114cc1e8f607f30e86b SHA-256: e3f59e6a1c8367ea0be5a6289a4a8150c1ed1d8793d02b1f28b6c0a336f816e4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document is identified as malicious due to its extensive use of external links, many of which point to a link farm designed for SEO poisoning. One critical heuristic indicates a direct link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=home%20inspection%20report%20pdf. The document body, though heavily obfuscated, contains keywords related to 'home inspection report pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=home%20inspection%20report%20pdf In PDF document text
    • http://files.coachandersonsclassroom.com/uploads/1/3/0/9/130968956/3733001.pdfIn PDF document text
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdfIn PDF document text
    • http://files.breadsnbakes.com/uploads/1/3/2/6/132695574/7046121.pdfIn PDF document text
    • http://files.mpmbowlny.com/uploads/1/3/0/8/130874110/6081140.pdfIn PDF document text
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdfIn PDF document text
    • http://files.jancancan.com/uploads/1/3/1/4/131406413/sosazidisajawaj-ledosol-vaxodavuv-ziwobedomanefon.pdfIn PDF document text
    • http://files.emeraldisletour.com/uploads/1/3/2/7/132740525/757c7c41725e84d.pdfIn PDF document text
    • http://files.electaylin.com/uploads/1/3/2/7/132740320/8322645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fobitogoxonu.files.wordpress.com/2020/06/97290168932.pdfIn PDF document text
    • https://naganaf.files.wordpress.com/2020/07/xadakejukakavaraxada.pdfIn PDF document text
    • https://vomaxepe.files.wordpress.com/2020/06/32901681266.pdfIn PDF document text
    • https://jifarilu.files.wordpress.com/2020/06/54353194089.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5871 4808 bytes
SHA-256: fc358623c265aca285f35742e2d5e125249ea3ad131921308d1c453512d95209
font_01_sfnt_off000068a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A4 9980 bytes
SHA-256: 3c0a29fc10d2a5cf26e242df0ec9489daa3b1cfb91dac00b1b75a03cbedf8ae2

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